[sdiy] Transporting line level audio in home / buzz-free USB wall warts?

[Doug Jackson]

We have been sending line level audio around outdoor performances for years.

The signal path is simple.

Source => DI Box => Balanced cable => (mixer or another DI Box)

Balanced signal paths are king.  Simple as that

As evidenced by the famous HumBucker pickups.

Kindest regards,

Doug Jackson

em: doug at doughq.com
ph: 0414 986878

Follow my amateur radio adventures at vk1zdj.net



On Wed, 19 Jul 2023 at 13:45, cheater cheater via Synth-diy <
synth-diy at synth-diy.org> wrote:

> > Why not send the audio via bluetooth?
>
> the protocol adds intelligibility problems due to compression, at
> least 250 ms delay which will change from speaker to speaker making it
> difficult to understand speech and making music annoying, and it
> doesn't work through multiple walls.
>
> > Or ditch the bluetooth speakers and install regular speakers running
> from an amp.  You could go 70V or standard without issues at those
> distances, though 70V would probably be easier.
>
> a 40 euro bluetooth speaker will provide sound quality far superior to
> anything you can build for 40 euro using an external amplifier, own
> transducer, and own enclosure. it'll also be easier to clean as it'll
> have a smooth surface compared to a self made wooden or 3d printed
> enclosure. it'll be much smaller, not getting in the way of what the
> purpose of the room is. and most importantly, it doesn't need to be
> built.
>
> a central amplifier can't have single channels turned off, wasting
> energy and generating heat which makes the room uncomfortable. a
> bluetooth speaker turns itself off almost fully every time there's no
> sound, even if just for a few seconds.
>
> power cables are thicker and more difficult to run hidden in a
> brick-and-concrete building, perhaps making this whole thing
> impossible to do.
>
>
> On Tue, Jul 18, 2023 at 6:47 PM Chromatest J. Pantsmaker
> <chromatest at azburners.org> wrote:
> >
> > Why not send the audio via bluetooth?
> >
> > Or ditch the bluetooth speakers and install regular speakers running
> from an amp.  You could go 70V or standard without issues at those
> distances, though 70V would probably be easier.
> >
> > On Tue, Jul 18, 2023 at 3:50 AM cheater cheater via Synth-diy <
> synth-diy at synth-diy.org> wrote:
> >>
> >> Hey all, I wanted to move audio from my media pc to rooms in my home
> >> and I was wondering if anyone had suggestions on an inexpensive piece
> >> of gear that'll do that. I just want to listen to podcasts and some
> >> music while i'm doing stuff around the house, nothing high quality,
> >> but I'd prefer not to have hum and static and strong high freq
> >> rolloff. I'd prefer to do this in analog so that I can turn on
> >> multiple speakers and they're in phase. I'll be moving the audio over
> >> a distance of ~ 10-15 meters to 4 different zones. In the target rooms
> >> I'm going to hook up inexpensive bluetooth speakers with aux input
> >> running off of a usb wall wart.
> >>
> >> Also looking for inexpensive European (Schuko-style) USB wall warts
> >> that don't have a lot of ripple. I have tried a bunch (~10?) of
> >> different usb power supplies over the years and almost all of them
> >> make the speakers buzz audibly. The only one that I have that doesn't
> >> do that is an ancient Samsung one that I got with I think my Galaxy
> >> S3. I hope it never dies to be honest.
> >>
> >> Obviously a better power supply circuit in the bluetooth speakers
> >> would make them not buzz, but I tried two different ones (starting
> >> with Anker Soundcore 2 and most recently Earfun UBoom L) and they all
> >> do that so... it is what it is.
> >>
> >> Best regards
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